Patent US2500728A successfully refreshed from Google Patents.
US2500728A
Expired / Lapsed
US
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Production of polymeric resin sheets by continuously polymerizing monomeric material
Assignee: Imperial Chemical Industries Ltd
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Filing: 1945-06-11
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Granted: 1950-03-14
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Expires: 1965-06-11
Abstract
No abstract record available.
Inventors
- 👤 Williams Edmond George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:59
CPC Classifications
B; B29; B29C; B29C39/00; B29C39/003; B29C39/006; B29C39/14; B29C39/16; B29C39/22; B29C39/40; B29K; B29K2033/00; B29K2033/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
THE PROCESS FOR PREPARING RIGID SHEETS, PLATES, AND THE LIKE SUBSTANTIALLY FREE FROM INTERNAL STRAINS AND STRESSES WHICH COMPRISES PASSING A MONOMERIC COMPOUND BETWEEN AND IN CONTACT WITH TWO MOVING SURFACES, PASSING SAID COMPOUND AND SURFACES THROUGH A REGION PROVIDED WITH POLYMERIZATION PROMOTING MEANS WHEREBY THE COMPOUND IS POLYMERIZED IN SAID REGION, BRINGING SAID MOVING SURFACES SLIGHTLY CLOSER TOGETHER AS THEY PASS THROUGH SAID REGION, WHEREBY CONTACT BETWEEN SAID COMPOUND AND BOTH SAID SURFACES IS MAINTAINED DURING THE POLYMERIZATION AND CONSEQUENT SHRINKING OF THE COMPOUND, AND REMOVING THE RESULTANT POLYMERIZED SHEET FROM BOTH SAID SURFACES.
References Cited (Backward Citations)
US2075735A
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US2154639A
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US2183520A
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US2268611A
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US2316274A
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US2345013A
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US2353717A
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US2419281A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |